Fotasy 40.5mm Silver Pro 1D super slim UV (Ultra Violet) Multi Coated Glass Filter, (Glass made in Japan, same class as HOYA Pro 1 series, 3rd Brand) Glass Made in Japan. Ultra thin 1mm glass ( same class as HOYA Pro 1 series). Pro Multi-Coated. Pro Digital multi-coated filters greatly reduce the appearance of lens flare and ghosting caused by reflections. Pro Multi-Coated. Pro Digital multi-coated filters greatly reduce the appearance of lens flare and ghosting caused by reflections. Low Profile Frame Ultra thin filter frames (3MM) to help avoid vignetting on super wide angle lenses are also designed to hold. Knurling Edge Frame . These filters are equipped with a straight knurling edge for non-slip, easy attachment and removal.